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Discussion questions 5
- Institution
- High Point University
Covers the questions that are asked for the 5th paper discussion about a reduction of mitochondrial DNA molecules during embryogenesis
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1. How does the mitochondrial genetic bottleneck contribute to the rapid segregation ofgenotypes during embryogenesis?
a. The mtDNA lacks protective histamines and therefore free radicals can cause
damage. The mitochondria isn't good at repairing itself. This causes rapid
mutation and then causes the new genotypes to be passed on primarily in the
female gene line.
2. What are the key differences between the single-sampling model and the multiple-
sampling model of the mitochondrial genetic bottleneck?
a. The multiple-sampling model assumes that the genetic bottleneck is present
evenly over the course of 15 cell divisions while the single sampling model
measures 1 division.
3. How does the partitioning of mtDNA molecules into different cells before and after
implantation affect heteroplasmy levels in offspring?
a. This could cause an uneven amount of the mutated gene to end up in one cell.
Leading to some cells that were fine and others that were severely mutated.
4. What role does mtDNA replication play in the development of primordial germ cells
(PGCs) and how does it influence the genetic bottleneck?
a. The variation of PGCs forming ended up with 40 unique lines. This affects the
genetic bottleneck by the same reasons that are listed in the first question.
5. What are the implications of the mitochondrial genetic bottleneck for the transmission of
pathogenic mtDNA mutations in humans?
a. Inconsistency in finding the mutation as it might only manifest if a threshold is
met.
b. Increased likelihood of occurring as if the maternal line has the mutation there
are little safeguards in prevention and repair.
6. How does the study's use of Stella-GFP mice enhance the understanding of mtDNA
segregation compared to previous methods?
a. Allows for a better understanding of what is occurring overall but also on the cell
level. This type of information allows for conclusions to be made that include as
much information as possible.
7. What are the potential consequences of mtDNA mutations on male and female fertility,
as discussed in the paper?
a. Can affect the male fertility reducing the effectiveness of the sperm.
b. Can affect the development of the embryo down the line and affects fertility
8. How does the timing of mtDNA replication and cell division influence the size of the
mitochondrial genetic bottleneck?
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